121221002020 has 12 divisors (see below), whose sum is σ = 254564104284. Its totient is φ = 48488400800.

The previous prime is 121221001939. The next prime is 121221002069. The reversal of 121221002020 is 20200122121.

It is a happy number.

121221002020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 43711101184 + 77509900836 = 209072^2 + 278406^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030525031 + ... + 3030525070.

It is an arithmetic number, because the mean of its divisors is an integer number (21213675357).

Almost surely, 2^121221002020 is an apocalyptic number.

121221002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221002020 is an abundant number, since it is smaller than the sum of its proper divisors (133343102264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221002020 is a wasteful number, since it uses less digits than its factorization.

121221002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061050110 (or 6061050108 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121221002020 its reverse (20200122121), we get a palindrome (141421124141).

The spelling of 121221002020 in words is "one hundred twenty-one billion, two hundred twenty-one million, two thousand, twenty".